Unfortunately we can’t provide a specific timeframe about how long they last, because it really is dependent on a number of factors, including how often they are used, how long they are used in a single stint, the depth of mud etc. Dawul Wuru have reported that they split fairly soon and they have been doing DIY reinforcements to make them last longer. From this, you can determine that the current life span of the boots is insufficient for Dawul Wuru’s use.
The area that gets the most damage (tearing) the fastest is the back panel of the boot, more specifically the triangular webbing parts on the corners of the back panel.
I hope this helps! Please reach out if you have any further questions or need anything clarified.